A man travels a distance of 18 km from his house to an exhibition by tanga at 15 km/hr and returns back on cycle at 10 km/hr. find his average speed for the whole journey. select one:
a. 12.5 km/hr
b. 2.5 km/hr
c. 4.5 km/hr
d. 12 km/hr
Answers
Answered by
3
d 12 kmph.is the correct answer.
Answered by
12
Here, the man travelled 18km with speed 15km/hr
Again returned 18km with speed 10km/hr
Here distance is same and speed is different
Apllying 2V1*V2/V1+V2
Here V1=15km/hr and V2=10km/hr
Then, 2*15*10/15+10
300/25=12km/hr
Again returned 18km with speed 10km/hr
Here distance is same and speed is different
Apllying 2V1*V2/V1+V2
Here V1=15km/hr and V2=10km/hr
Then, 2*15*10/15+10
300/25=12km/hr
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